In a previous post we went over connecting to Microsoft GraphApi using PowerShell and Graph Rest API.

In this post we will be going through using the PowerShell SDK as I am more familiar with PowerShell and this will make creating scripts and querying data easier.

First step to use the Graph SDK is to install the PowerShell Module.

Open an admin PowerShell Window and run the below command.

Install-Module Microsoft.Graph

Once the module is installed we can now connect to graph.

I only want to query user information so I will use User.Read.All as the scoped permission.

Below is a link to the Microsoft document on graph permissions.

Microsoft Graph permissions reference – Microsoft Graph | Microsoft Docs

Connect-MgGraph -Scopes "User.Read.All"

Go to the URL in the PowerShell response and enter the code.

Accept the permission request.

Once accepted, PowerShell should now be connected.

All command’s in the Graph Module use MG in the name which can be used to find commands needed.

To get all users we can use Get-mguser.

By default the Graph SDK will use API v1.0 to change to the beta version which has more information and is the default one that I use.

To set the profile run the below.

Select-MgProfile -Name "beta"

Now if we look at the user type it now returns guest or member value since the change to the beta version.

We can also use filters to only return required users, the below will only return guest users.

Using connect-msgraph with a user account requires manual steps to connect so it’s not great for automation.

We can use a certificate and app registration to automate the connection.

Use app-only authentication with the Microsoft Graph PowerShell SDK – Microsoft Graph | Microsoft Docs

We covered the app registration in a previous post so we wont go over creating the app registration again.

First step is to create the cert that will be used, we will be using self signed cert but you can use a cert issue from an internal CA also.

To create the self signed cert I used the below command

New-SelfSignedCertificate -DnsName TennatDomainName -CertStoreLocation "Cert:\CurrentUser\My" -FriendlyName "Graph_SDK"

Once the cert has been created, export the cert so that it can be uploaded to the App registration.

Get-ChildItem Cert:\CurrentUser\my\CertThumbprint | Export-Certificate -FilePath C:\temp\Graph_SDK_Cert_Test.cer

Logon to Azure portal > Azure Active Directory > App registrations > graph app registration

Select the exported certificate

Once uploaded the cert detail will show under certificates.

Now that the cert is uploaded we can use either the thumbprint or the certificate name, ApplicationID and TenantID to automate connections to Microsoft Graph.

Connect-MgGraph -CertificateThumbprint Thumbprint -ClientID YOUR_APP_ID -TenantId YOUR_TENANT_ID

I used the below to automate checking for Guest users and there sign-in logs.

$Cert = "Thumbprint"
$AppID = "YOUR_APP_ID "
$TenantID = "YOUR_TENANT_ID"

Connect-MgGraph -CertificateThumbprint $Cert -ClientId $AppID -TenantId  $TenantID

$GuestUsers = Get-MgUser -Filter "usertype eq 'Guest'"

foreach ($Guest in $GuestUsers) {
Write-Warning "Checking Guest User $($Guest.DisplayName) SignIn Logs"
Get-MgAuditLogSignIn -Filter "UserId  eq '$($Guest.ID)'" | 
Select-Object UserDisplayName,UserPrincipalName,IPAddress,AppDisplayName,ResourceDisplayName,ClientAppUsed
}

In a previous post we went through configuring and connecting to Microsoft Graph API.

In this post we will going through querying sign-in logs.

Connecting to Microsoft GraphAPI Using PowerShell – TheSleepyAdmins

We have been trying to audit guest account activity and sign-in logs are the only way I have been able to find if these account’s have been active for the last 30 days. Instead of manually filtering sign-in logs from Azure AD I want to automate this using Graph.

To query sign-in logs the below API permission are required. since we are using client secret we only require Application permission.

Below is the link to the Microsoft doc I used for getting info on listing sign-ins.

List signIns – Microsoft Graph v1.0 | Microsoft Docs

Permission type	Permissions (from least to most privileged)
Delegated (work or school account)	AuditLog.Read.All and Directory.Read.All
Delegated (personal Microsoft account)	Not supported
Application	AuditLog.Read.All and Directory.Read.All

Next step was to run the command to get to the access token for connecting to Microsoft Graph this is covered in the previous post so we won’t be going over that here.

To connect to the sign-in Graph use the below Url

https://graph.microsoft.com/v1.0/auditLogs/signIns

Below is the command to connect and view all sign-in logs data

$LoginUrl = "https://graph.microsoft.com/v1.0/auditLogs/signIns"
(Invoke-RestMethod -Headers @{Authorization = "Bearer $($token)"} -Uri $LoginUrl -Method Get).value

This will return all the default values for each sign-in log.

We only wanted to have Displayname,UPN,IP,App used and date the log was created. We also wanted to only have Logs that where created in the last 30 days.

$LoginUrl = "https://graph.microsoft.com/v1.0/auditLogs/signIns"(Invoke-RestMethod -Headers @{Authorization = "Bearer $($token)"} -Uri $LoginUrl -Method Get).value | Select-Object userDisplayName,userPrincipalName,ipAddress,clientAppUsed,createdDateTime | Where-Object {$_.userPrincipalName -notlike "*DomainName.com" -and $_.createdDateTime -gt "2020-09-29"}

Below is the results from the above query.

Now that we have the query, we can either run the query manually or in my case I will be setting up an script to run on a scheduled to export this data.